Oxygen consumption (VO
[panel A] and as a % of peak incremental values [panel B]) during constant workrate exercise (CET), ventilation (V
[panel C] and as a % of MVV [panel D]), tidal volume (V
, ml [panel E) and as a % of vital capacity [panel F]), respiratory rate (RR, breaths·min
) and O
pulse saturation (SpO
) in relation to constant workrate endurance time (s). Values are mean ± SE. White filled circles are normal BMI, grey are overweight and black, obese patients. * = p < 0.0001; † = p < 0.01; ‡ = p < 0.001.